Not everyone has, what they would consider, 'fantasies'. For example, whilst one person would consider a woman in uniform a fantasy, others will see it as a nice passing thought, not necessarily something they will act on. It could be that your partner genuinely has no reoccuring sexual thoughts that he would consider a fantasy and finds the whole experience a turn-on.
Be gentle with him and try to bring sex toys up in conversation. Maybe casually mention that you use them on your own - for many men this is a turn on but just to be cautious, say that they're great, but nothing beats the real thing! If he seems fairly accepting of this and the conversation is going well, maybe get him to browse LoveHoney with you at some point and choose something together.
Alternatively you may want to take a look at using a small, discreet vibrator with him such as a bullet vibe. Huge dildos and all singing and dancing vibrators can be pretty intimidating to a bloke but something small and cute like the LoveHoney Bang Bang Bullet Vibrator is quite inoffensive.
At first, you may want to use it on yourself, letting him watch you and enjoy the view! As he gets used to it, you may want to venture as far as to press it against your cheek whilst you're giving him oral sex or even running it gently over his testicles and perineum.
As much as it's important for him to stop when you say so, do the same for him. If he's clearly not into it or asks you to stop then do so and carry on as normal. Bringing it up at that moment will be awkward and embarrassing for you both and it's possible that his ego will be feeling bruised, so simply set your new vibe aside and carry on as normal, reassuring him that he's a great lover and does a wonderful job of pleasing you.
Not every man is open to sex toys, but it's worth a go!